I am 25 years old and have been on birth control since I was 16. And my periods have always came like they should. 3 months ago my doctor switched my birth control to another brand called Loestrin 24. But last month I did not have my period. I waited 5 days and then took a pregnancy test...which came back negative. I then waited another 4 days and took another one and it too was negative. So far I am about 2 1/2 weeks late. Today I had a little spotting. I am just wondering if maybe switching to a new brand of birth control had an effect. But I am wondering why it took almost 3 months for it to happen. B/c I have been on Loestrin now since the beginning of August and my periods came like they normally did.

Thanks for any advice!